I would suggest there are multiple reasons.
They have a jump on everything after spreading out of what was the "super secret server".
People are still butthurt they weren't in the "super secret server club".
Homecoming has a larger playerbase which makes them "the man" as in a natural adversary for other servers seeking drama.
Promoting negativity about HC could (in their minds) increase their player base.
People are just sad, selfish individuals to be honest, some seek drama for dramas sake, others are just jealous of things other people have regardless of whether they have a need too or not, Homecoming has never, to my knowledge, been anything other than courteous to other servers, if they were not the messages would have been posted all over the internet. If other servers are still trying to paint a narrative of homeing devs being "bad guys" then its likely just bait, just so pointless, you got the code and tools to do what you want so go do it.